    function siteTime() {
      window.setTimeout("siteTime()", 1000);
      var seconds = 1000;
      var minutes = seconds * 60;
      var hours = minutes * 60;
      var days = hours * 24;
      var years = days * 365;
      var today = new Date();
      var todayYear = today.getFullYear();
      var todayMonth = today.getMonth() + 1;
      var todayDate = today.getDate();
      var todayHour = today.getHours();
      var todayMinute = today.getMinutes();
      var todaySecond = today.getSeconds();
      /* Date.UTC() -- 返回date对象距世界标准时间(UTC)1970年1月1日午夜之间的毫秒数(时间戳)
      year - 作为date对象的年份，为4位年份值
      month - 0-11之间的整数，做为date对象的月份
      day - 1-31之间的整数，做为date对象的天数
      hours - 0(午夜24点)-23之间的整数，做为date对象的小时数
      minutes - 0-59之间的整数，做为date对象的分钟数
      seconds - 0-59之间的整数，做为date对象的秒数
      microseconds - 0-999之间的整数，做为date对象的毫秒数 */
      var t1 = Date.UTC(2022, 09, 27, 22, 00, 00); //开始时间
      var t2 = Date.UTC(todayYear, todayMonth, todayDate, todayHour, todayMinute, todaySecond);
      var diff = t2 - t1;
      var diffYears = Math.floor(diff / years);
      var diffDays = Math.floor((diff / days) - diffYears * 365);
      var diffHours = Math.floor((diff - (diffYears * 365 + diffDays) * days) / hours);
      var diffMinutes = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours) / minutes);
      var diffSeconds = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours - diffMinutes * minutes) / seconds);
      document.getElementById("sitetime").innerHTML = " 本网站已运行 " + diffYears + " 年 " + diffDays + " 天 ";
    }
    siteTime();